Means for use in separating the more soluble constituents of a material from the less soluble constituents thereof.



No. 863,168. PATENTED AUG- 13, 1907.

T. GRISWOLD, JR.

MEANS FOR USE IN SEPARATING THE MORE SOLUBLE OONSTITUENTS OF A MATERIAL FROM THE LESS SOLUBLEOONSTITUENTS THEREOF. urmoumn rmzn rum. 1000.

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WITNESSES: INVENTOR TNI NOIIII Plfnll 17.. wlllmvd'fdll. 11..

No 863,168. PATBNTED AUG'.13, 1907. T. GRISWOLD, h.

MEANS FOR USE IN SBPARATING THE MORE SOLUBLE GONSTITUBNTS OF A MATERIAL FROM THE LESS SOLUBLE GONSTITUENTS THEREOF.

.nrnmmlox mum .mt .1v, 1m. v

' WITNESSES: JNVENTOR ml mils-Ia rift" I! VAlmmiNm-l.

No. 863,168. EIATENTED AUG.18, 1907. T. GRISWOLD, J. MEANS r011 USE IN SEPARATING THE MORE SOLUBLE ,consmusurrs or A MATERIAL mom THE LESS SOLUBLE oousmuamzs THEREOR.

APYLIOATIOI FILED Ill. 17, 190B- I I I I I w I v I I I I I f V I A! wnnzssis: 1

T. GRISWOLD, Jn. MEANS FOR USE IN SEPARATING THE MORE SOLUBLE OONSTITUENTS OF A MATERIAL FROM THE LESS SOLUBLE GONSTITUENTS THEREOF.

APPLIUAIIOI'IILBD uml'z. 1006.

4 SHEETS-SHEET 1,

WITNESSE I PATEHTED AUG. 13, 1907.

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Not to bu tan b :totn tho ates.

UNlTEl) STATES PATENT OFFICE.

'.lllt.)i\lAS GRISWOH), Jlt, Oi" MIDLAND, MICHIGAN, ASSIGROR TO THE ONTARIO NICKEL COMPANY, blMlllil), ()l" \YOlt'llllNGlON, ONTARIO, CANADA, A CORPORATION.

MEANS FOR USE IN SEPARATING THE MORE SOLUBLE GONS'IITUENTS OF A MATERIAL FROM THE LESS SOLUBLE CONSTI'IUENTS THEREOF.

Specification of Letters Patent.

Patented Aug. 13, 1907.

Application filed January 17,1906. Serial No. 296,652.

'."n all irhont it may miter/n:

l'nit known that l, 'lnonns tiuisuoiin, Jr., a citizen of the l'nited States, a resident of .\lidland, county of )lidland, and State of Itlichigan, have invented a new and usctul Improvement in .\lca-nslor Use in Separating |l|c .\lore holublt- .'ottsl.llttt'l|ts ot' a Material llttlll the lit-si bolnblt- Constituents 'lIn-reot', of which the following is: a specification, the principl ol the invention being ln-rt-in explained and the best mode in which .l have contemplat d applying that principle,- so as to distinguish it ll'tilll olln-r inventions.

This inv ntion relat s to the art of separating the more readily soluble constituents of unto-rials from their less readily soluble or insoluble constituents by the prom-ss ol' washing, and is particularly adapted to the trealnn-nt ot' ll tt'llll 'lll precipitates, slimcs, pulps, nnnls. sediments. and the like. the treatment of which t-onstitutes an important feature of many industrial processes. it is also adapted to the washing ot' impurities and mother liquors out of crude products, the extraction of metals or the salts of metals from their 1 he extraction of sugars, extraets, colors, dyes, t Illt' lilo, The object or sut-h trashing is usually to dissolvi- Ill take up, by nit-ans ot a fluid solvent or v; tlnoluble'nntltcr or "values" contained in thctllnll'l'lnl b ing treat d, and to thereby separate these "\alut-s" from the less soluble material or inoluble n'nil -rial, sediment, or sludge and from the insoluble matter that remains therein. liy-the term values" is: meant. the substances *to be recovered or, in som processes, the impurities to be eliminated. 'l'h s "valor-s may be capable ol solution in a solv nt. and. in that case. the separation \vouldbe based upon that solubility: or, the "tallies" may be capable ol stizlltllitlll from the utltcl' constituents of the material being treated by reason of their capacityto remain mechanically suspended for some time in a fluid inedium, :-llltllzl1'l to the separati n of slimes in ordinary water it will lie set-n from the further description of my invention that the capacity of any single constitu nt or several constituents to rcmain mechanically suspended tor some time in a llnid medium is equiv-a lent. in so for as the separation from the other constituonts ls t' ilK't'lll l. to that constituents entering into solution.

.'\s an xampl ol the washing process referred to, take a case in whi h it is desir d to remove iron from an a ueous solution in which it exists as a soluble salt in 'conjunclion with soluble salts ol other metalsincapablc of precipitation by llT lI"ttt which is used to precipitate the iron. such a salt being, for example, sodium (llllll'ltl. The iron may be precipitated by the addition of aproper proportion of an alkalinecarhonate loitls.

or hydrate, and, alter agitation and settling, the floccnlent iron precipitate will subside as a pulp or sludge and the clear solution of a part, oi the unpreeipitated nn-tals remain over it This separation, although quite distinct, is a very slow one, is more dependent upon the area of the separatitig chamber than upon its depth,

' and the pulp cannot be settled to a concentrated form.

in the pulp, but in very much diluted solution, and atthe expense of much solvent, although weak wash water may be systematically increased in strength, as ordinarily practiced, by being used with pnlps of a progressively increasing percentage of values". The treatment ol' large quantities of materials by thejabove method requires the use of many large chambers provided with stirring devices and power to drive them, and the tying up of a large money investment in material in process. and, consequently, this progressive treatment cannot be utilized to the l'ullcst. extcnt because. of a commercially prohibitive complication of apparatusand supervision. Some pulps are easily treated by liltmtion, leaching, settlement and decantation, or other processes. Some are of a colloidal nature and lilt'ration will not readily remove the col- Others will clog a lilter so soon that filtration is impracticable.

My invention is especially-adapted to treat rapidly and elliciently those slimes 0r pulps which, having a slow rate of settlin". make separation by settlement and decantation, as ordinarily practiced, ,very slow,

and Wllichztte not adapted to economical treatment by liltration or leaching.

The invention aims to accomplish the separations above outlined, or, by suitable adaptation, to accomplish such separations us are required in other industries, as, for instance. the recovery oi cyanid of gold from slimes,

The object of my present invention is to wash the pulp and to then remove and vash the resulting sludge, these washing and settling,' operations being automat'tcally repealed any desired number of times; and further, to accomplish these results in a rapid, economical and etllcient manner.

Further objects are to reduce the investment in apparatus and machinery, to remove the values" in pulps, slimos, etc., to as full an extent as may be desired, to reduce to a tow sum the investment tied up in the material in process. and to extract the soluble matter in as coin-entrated a form as possible, thereby reducingthe quantity ot' solvent or wash-water re-v quired. and the tankagc necessary to hold the extracted \nlttcs. This latter improvement, viz. that f extracting: the values in as concentrated a form as possible and thereby reducing the tankage, will he found to he a. very im 'iortant part ol my invt-ntion.

This in vent ion const ittttcs in cl't'cct a combination of devices whereby solvent or washing Iluid is caused to traverse in one direction through a series of settling and mixing chambers. and pulp orsludgc is simultaneously caused to traverse in the opposite direction iltl'lltlL'lt the same series. The sludge is thereby repeatcdly washed. settled and rcwashcd in solvent of prom ively increasing solven t power. and carrying a decreasing burden of values". tintil when discharged at the end of the series. the sludge is practically de privcd of soluble 'alucs. The arrangement of the atiparatus is such that the solvent entering the series fresh is used first to wash sludge that has been deprived of nearly all its soluble values". The partly charged solvent is thereafter used in the subsequent settling and mixing chambers of the series to successively wash the charges of sludge, each of which charges is somewhat stronger in soluble values" than the previous one. The effect ttpou the lt'csh solvent is to suc essively add to its quant it ies of soluble values until when the solvent leaves the series it is highly charged with these va|ucs".

'lhc annexed drawings and the following: description set forth in detail certain means embodying the invention and one mode of carrying out the same. such disclosed means and mode constituting but one of various ways in which the principle of the invention may be used. ()I' such disclosure. it should he stated the mechanical features alone are herein claimed. the general process. or method of operation. which these excmplity bein reserved tor a sc ntrate application tiled January t2. tour. Serial x. was).

In said annexed drawings: Figure l is a vertical longitudinal section of a preferred form of the washing apparatus. Fig. 2 is a top plan view of the same. Fig.2. 3 is a vertical transverse se t ion taken on the line 3--3 ol- Figs. 1 and Fig. l is a side elevation of the apparatus for dipping the ilnid or semi-fluid sludge from one chantbcr-compartment to another, the dipping vessel being shown in its lifting position. Fig. 5 is a similar view. showing the vessel in its discharging pos tion. Fig. 6 is a top plan view of the parts illustrated in Fig. 4. ing: apparatus in which. for the sake of cl-carness. the stirring: devices are omitted. This figure shows the means of operating the dippcrs.

Tho uppttlulU- i' consists in a series of settling clunnhers. the consccnt ive chambers of the series being counected together by pipes or conduits, there being intc'rposed in th length of each conduit a suitable mixing apparatus for mixing the sediment; or sludge taken from the bottom of one scttlin chamber with the sol vent solution drawn from the top of that settling chamber which is two removed from the one trom which the sediment is taken. While, 1 have shown the mixing Fig. 7 is a persptu'tive ot' a part of the wash chambers built separately and connected by pipes to the settling chambers, it would be entirely within the spirit of my invention to build the mixing chambers as an integral part of the separating chambers, in which case the pipes or conduits could be replaced by openings in the partition walls.

ln general the method of operation is as follows:- The pulp or other material to be treated is admitted to the first mixing chamber of the series where solvent that contains a. large. per cent of soluble values is added to it: The mixture of pulp and solvent thus formed is settled in the first separating chamber of the series, the effect of settling being to separate the mixture into a sludge weaker in soluble values than the original pulp, and it solvent more heavily charged with soluble values than before. The heavily charged solvent is discharged irotn the apparatus and then the sludge that remains is passed to the next mixing chamber, where it is again mixed with solvent weaker in soluble values than the solvent employed in the first mixing chamber. The resultant mixture is again settled in the next separating chamber of the series and is by so settling once more separated into a still weaker sludge and a more heavily charged solvent.

The process continues through the whole series of receptacles until the resultant sludge deprived of practically all of its soluble values is discharged at the end of the series.

In the drawings F is a vessel containing the settling chambers 1, 2, 3, 4, which are preferably hopper-bottomed. While I have shown and described the settling chambers of the series built in one tank structure F. I do not desire to eonlinc myself to such construction, it being obvious that the various settling chambers might be separated if desired.

In each receptacle I prefer to provide inclined battle plates ti which extend across the tank F from side to side. The purpose of these batlle plates is to increase the area of surface upon which the sludge may settle, to reduce the vertical distance through which any given particle of suspended sludge must fall before meeting a contacting surface, thereby increasing the working capacity of the separating chambers over the capacity they would have were the baflie plates omitted.

A, 'B, C, D, and -E are termed mixing chambers", their office being to mix the sludge or sediment. from one settling chamber with solvent from the settling chamher two removed therefrom. These mixing; chambers are small tanks divided into three compartments B, lF. and B, as shown in Fig. 3. The first compartment ll receives the sludge from the bottom of the settling chamber 1, the sludge passing though the pipe 1)". The sludge is dipped by means of a mechanical dipper which will be later described, from compartment. B

' into compartment B where it tningles with washing or solvent fluid that enters through the pipe K being drawn from a point ncar or at the surface of the liquid in settling chamber 3. The sludge and solvent pass down to the bottom of compartnn-ut lb and thence through an opening 0 into compartment 15* in which is mounted a revolving shalt S carrying stirring paddles P. This stirring apparatus thoroughly mixes the sludge a'nd sol vent. the mixture being delivered through pipe in into the top of settling chamber 2, whore the mixture is set tled:

.lleginniug at the lett in Fig. 2, fresh wash-water, solvent, or other suitable medium for dissolving or taking up the values. enters thesystemate, flows bygravity through the mixing apparatus I) and the. pipe m through stweessive alternate mixing and settling chambers, as shown by arrows, and runs out at f charged with the soluble values which it has taken up from the pulp and sludge during its passage through the apparatus. Untreated pulp is run into the apparatus at g, and delivered by means of the dipping mechanism into the middle eompartment A of the washer A. Here the pulp mixes with the strongly eharged solution whieh runs into A from the settling ehamber 2 through pipe 1'. The mixture flows down and into the agitating compartment A where the pulp and solvent are thoroughly mixed and the pulp is washed. From A the thin mixture flows through the pipe m into the settling chamber 1, and theuee down diagonally as shown by the arrow in Fig. l, and up through the spaees between the baffles 11 llere the sludge drops out and slides down the ballle plates into the hopper below. The eom-entrated solution leaves the sludge on the batlle plates and flows out atf. The sludge whieh has been separated by settling in reeeptaele 1 passes by pipe 1) into eompartment ii of the mixing chamber 13.

I Through the pipe k a less eoneentrated solution simultaneously passes from settling ehamber 3 into compartment B of mixing ehamber it of the mixing apparatus. Thorough mixture takes plaee in B, and the resulting fluid isdelivt red to reeeptaele 2 where it settles in the same manner as has been deseribed for reeeptaele i. In similar manner settled sludge from 2 is washed in t, res ttled in 3. and rewashed in T) with fresh solvent. resettled in and'dipped out of the system by the dipper l5. It is thus seen that sludge from the first settling rhamber is repeatedly washed in solvent r'arrying a eonstantly (let-reusing burden of 'values. until when diseharg d from 13 through pipe h the sludge is praetieally free from soluble "values. The fresh solvent let in at e is r peatedly used to wash the sludge in whieh the soluble "values" are eonstantly inereasing until when the solvent is let out atfit is highly eharged with these values. This invention then eonsists in effecting a eontrary flow of sludge and solvent through a series of mixing and settling ehambers and the eonsequent production of a solution eoneentrated in "values. By inert-using the number of mixing and settling units in the series. the pereentage of soluble "\nlues remaining in the diseharged sludge may be redueed indefinitely and the eflieienr-y of extraetiou may be raised to a eorrespondinglyhigh point.

it will be understood from th fortgoing desetiption Iluu the sue tssful operation of this apparatus dots not dept lltl to any great extent upon th partienlar form ol" meehanisln by whit-h the sludge is eaused to flow from one r' ftlltpzll'lmelll t' the ttling ehambers through th mixer into another settling ehamlu-rduring the putt-- es-s of mixing. Any 1 itahle l'trm ef (ltVlt e may be ust d [or this purpose without (it parting from the spirit of my invention. but for the purpose of illustration I hav shown a form of dipping apparatus whieh operates satisl'aetorily on tloeeulent pret-ipitatt This dipping apparatus eonsists in a suitable reeeptaele or measuring tank N pivotally mounted at its lower end to an 1lpright support N eapable of vertienl movement, so

that the tank can he dipped into and out of the sludge in the first eompartment of the mixing apparatus. 'lo empty the tank when it is raised to the top of its travel I provide a suitable trip n preferably comprising a horizontal projeetion at. the lower end of the tank whit-h eontaets with the under side ol a suitable lixed stop n carried by any eonvenient part of the framework, so as to overbalanee the pivot-ally mounted tank when it reaehes the top of its travel. To permit the tank to retain its vertieal position after the liquid has been emptied from it: and the support N has assumed its lowermost position. I provide a suitable count-en balanee n projeeting from the side of the tank opposite. that on which the trip is loeated. The vertieal. movement of the tank and the. upright support. on Whieh it is mounted may be aeeomplished by any suitable and eonvenient. means. one form of whieh is shown in Fig. 7.

'loinsure that the measuring tank shall always eontain the exaet amountot sludge so as to produee uniform [low of sludge an o ')ening or perforation may be provided at any desired height at the side oi the tank so that the tank eannot till above that point. I prefer in praetiee to seeure a. uniform flow of sludge through the entire appz'u'atus by operating all the various dippers N simultaneously or in rotation. the former being aeeomplislual by the means illustrated in Fig. 7. where three mixing ehumbers are shown eonneet-ed to the eel-responding settling ehambers. The dippers are hung on belleranks 1t whieh are operated by a reciproeating pulling bar N to which they are pivotally eonneeted. A to-and-t'ro motion of the bar eauses an up and down motion of the dippers. Some materials. sueh as sands. tinely erushed or ground ores. and the like. will require speeial forms of clippers and settlers.

\Yith many materials the battles aid in produeing rapid settlement and separation. Various forms of battles may be used as desired. it should also he pointed out that it is .not essential to their proper aetion' that the mixture of solvent and sludge be led into the settling tanks beneath sueh ballles as shown in the preferred form of apparatus illustrated. for said mixture may he obviously delivered. if found desirable. on to their tops just as Well.

While I have shown and deseribed the apparatus organized to seeure the necessary flow of solvent and sludge by dipping the sludge and permitting the solvent to flow by gravity through the reeeptnt'les. it is evident that the same purpose might be'atlained by dipping or pumping both the solvent and sludge. or pumping the solvent and permitting the sludge to [low by gravjt y.

I wish to eall purtieuln attention to the fut-t that in the (-lairns following this deseriplion my ehoie'o of names for the two eoustituen-ts of the material whit-h are separated one from the other. involves the use of the more soluble eonstituents" and the lesssolublo eonstituents", and the ehoiee of these names is made advisedly, tor the reason that materials which are eommonly classed as insoluble are regarded by chemists as soluble, and are differentiated into elasses whieh are slightly soluble and very slightly soluble. This invention is adapted to the. separation of the more soluble eonstituents of a material from its less soluble eonstituents. As regards the separalion which takes place in each successive settling cllalnlici'. the lat-i, should he noted that. neither the lluid not the solid constituents are completely sepa-.

rated. At least. it is not necessary to the successful operation of the invenlion that. they should he so stpal'aied. ii, is necessary only that the mixture be separated to such an extent that, one. portion contain a larger percentage oi the less soluble constituents than the other. or, in some cases. that one portion contain all of the less soluble constituents together with a portion oi the more soluble constituents. either undissolved or in solution. The use of the term separated is meant to cover all ihcse cases. the eventual result. being governed. first. by the kind oi material being treated; secondly. by the number of settling and mixing chambers utilized; and. thirdly. by various changes anti modifications which may creep in at times as separate elements to modify the general result. such general result being. as outlined above, the separation of the mortsoluble constituents of a material from the .less soluble constituents thercol.

Having thus described my invention in detail that which i particularly point out and distinctly claim is:

l. in means for use in sepztratina the more soluble coustiluenis oi a material from ihe less soluble constituents lhcreol'. the combination ota series oi settling chambers and mixin; chambers: means arranged to convey unlike constituents from a plurality of said settling chambers. respct-tiveLv. to said mixiin. chambers: and means for circulating all said constituents through said mixing chambers in the same direction.

3. In means for use in separating the more soluble co'nstituents of a material from the less soluble t'oilsiiillt'ills thereof. the combination of a series of settling chambers anti mixing chambers: means arranged to convey the upper constituent from some of said selilim: chambers. and the lower constituent from other of said settling chambers. respectively. to said mixing chambers: and means for circulating both of said constituents through said mixing chambers in the samedirection.

:i. in means for use in separating the more soluble consiitnt-nts ot' a material from the less soluble constituents thereof. the combination of three settling chambers: a mixi chamber: means arranged to convey the upper constituent of one settling chamber and the lower constiiuent oi another settling chamber. respectively. to saiti mixing rhan|her:'and' means arranged to convey both of said consiltuents to said third separathn. chamber.

4. in means for use in separating the more soluble coir stiiuents oi a material from the less soluble constituents thereof. the combination of three settling chambers: a mixing chamber. means arrannetl to convey the upper constituent of one settlim: chamber and the lower con siiiuent of another setilin; chamber. respective to said llllXlll}: chamber: means for circulating both of said constitucnts through said mlxlm. chamber in the same direction: anti means arranged to convey both of said constituents to said third scttlinr; chamber.

5. in means for use in separating: the more soluble constltttrnts of a material from the less soluble constituents thereof. the combination of a series of mixing and settling. chambers: means adapted to cause said material and a solvent. respectively, to flow through said series of chambers in generali opposite currents: and means adapted to cause said currents to How in the same direction through said tnixim. chambers.

i. in means for use in separating the more soluble con stltuents of a material from the less soluble constituents thereof. the combination of a series of settling chambers: .i mixing chamber. means establishing fluid connection between the latter and a plurality of said settling tlitlll'l' hers: independent means establishing fluid connection between said mixing chamber and other of said settling chambers: anti means adapted to cause currents of said material and a solvent. respectively, to flow through said settling chambers, mixing chamber and connecting means in general opposite directions.

7. In means for use in separating the more soluble consti'tuents of a material from the less soluble constituents thereof. the combination of a plurality of settling chambers; a mixin chamber; means establishing fluid connections between the latter and two of said settling chambers and arranged to cause the material to flow from the latter to said mixing chamber; and means establishing fluid connection between said mixing chamber and another of said settling chambers. and arranged to cause material to liow from the former to the latter.

H. in means for use in separating the more soluble constltuenis of a material from the less soluble conntitucnts illerefli', the cmnblnatlon of a series of settling chambers; a series of mixing chambers, each settling chamber in'one oi said series being; directly related to a mixing chamber in the other series; conduits establishing llultl connection between the mixing chambers, and a plurality of said settling chambers, and arranged to cause material to (low from the latter to the former; and other conduits arranged to convey matcrial from said mixing chambers to those seltliin. chambers to which said mixing chambers are respectively related.

ii. in means for use in separating the more soluble constituents oi a material from the less soluble constituents thereof. the combination of a series of settling chambers; a series of mixing; chambers, each chamber in one of said series being directly related to a chamber in the other series; conduits establishing: lluid connection between the mixing chambers. and a plurality of said settling. chambers, said conduits arranged to convey material to said mixing chamber from settling chambers upon both sides or the latter. and other conduits arranged to convey material from said mixing chambers to those settling: chambers to which said mixingchambers are respective];- related.

ill, In means for use in separating the more soluble constitutents of a material from the less soluble constituents thereof. the combination of a plurality of settling chambers: a mixing: chamber: means establishing fluid connection between the latter and the upper part of one of said setilinjl. chambers. and the lower part of another of said chambers. respectively: means establishing fluid connection between said mixing chamber and a third settling chamber: and means for circulating material through said mixing chamber.

11. in means for use in separating the more soluble constiiut'ents of a material from the less soluble constituents thereof. the combination of a plurality of settling climahers. a mixing chamber: conduits connecting the latter to the upper part of one of said settling chambers, and to the lower part of another of said chambers. a conduit concatin: aid mixing chamber to a third settling chamber: and means for circulating matcrial through said mixing chamher.

it. in int-aim for use in separating the more soluble constituents of a material from the less soluble constituents th reof. the combination of a plurality of settling: chamhers: a mixing. chamber: conduits connecting: the latter to some of said settling chambers. respectively: means adapted to cause material to liow from said settling chambers. to said mixing (ll-lillilil': a conduit connecting said mixing chamber to other sctiling chambers: means adapted to cause material to ilow from said mixing chamber to said last-named settlim. chambers: and means for circulating: in the same direction through said mixing chamber all constituents of the material being separated.

iii. in means for use in separating the more soluble constituents of a material from the less soluble constituents thereof. the combination of a plurality of settling chamhers a mixing; chamber a conduit; connecting: the latter to the upper part of one of said settling chambers and adapted to convey material by gravity to said mixing chamber; a, conduit connecting the latter to the lower part of another oi said settling chambers: means adapted to force material from said last narned settling chambers to salt] mixing chamb r: a conduit: connecting the. latter to a third settlinr; chamber and adapted to convey material by gravity to said settling chamber: and means for circulating material through said mixln chamber.

14 in nu-nns for so In Hilliiiiiiillg tine moi-u soluble-con- .-iiiur-nis ol :1 nmiurini i'l'ulii ilio luss soiuhlc constituents Hum-oi. ilnvumhhmilun ul' :1 plurality of'settiing cham- Iwi-s; in mixing (rhnlniwl' having (-uinpni'imentn; conduits i'iiiiliii'iilli: snid mixing uhnniiwr mmpnl-tinonts to $401!! of snhl Hliiiilik (-lnunIwi-n. nmi "(iiililid in discharge nihicl'inl inin snlll vunnnu-lnwniu: lm-nns minpivii lo (iiiiYOl' lllilloi'lnl lrunl onv mixing: i-immlwl' i'iillllliii'iliillli i0 nnuiinr; illlli :l i'ollilnli :ninplmi lo iiiiiYii' mnivrlul ll'mn Hlliii mixing t'iilililiili' in iiiii' ni snhi Siliiiilfl i'iiliillilii\ if. in nit-ans I'mnsu in xvparniinn' ihv mom noinhlo consiiili iiis iii a nmivrlnl ilnlll ihv loss soluble constituents tin-roof. lhu vomhlnnlion oi n plurality of Huitling chamhm-s; in mixing ('iiili!li)0i' having compartments. a conduit mum-cling ono of said mixing clmnllwr cumpartmenis iu lln: iun'vx' llnri oi one of said settling chambers; a conduit (flliilii'ifiiiig n .wmmi mixlng-chamhur compartment to tho nmn-r pin-i oi anoint-r of said settling chnmln'i's; munns :nlnplmi lo (iviiW-i' nmiorini from ono of said mixing-(aiminill-l ('Uiiljiili'iiliitlllH inio mid SiECi llii mixing-clnunhcr (:ompurilni'ni :nni 2|. (:onduii' mlupi'mi to deliver inatorinl from Hilili svuumi niixing-cinunher com uli'tnlont into a. third sotlliln: chnlnliur.

i l. in llH'llllF for use in separating tho more soluble consLiim-nis of h nmivrini from the ions soluble constituents iln-n-ot', ihu (:uliliiiiiililiOfl of u piurnilty 0|? settling chamhol's; i1 mixing chamber having compartments; a conduit mum-citing one of said mixing-chamber compartments to the lower part of one 01' said settling chambers; a conduit connocting :1 second mixing chamber compartment to the tumor part of unothm' settling chumhur; u dipping mechanism named to dlivvinnilm-ini lnimnnlituniiy in predeterminvd vlmrgos from mid unc mixing chamber compartment into said second mixing chumhvi' comp-.utinenii; and a cow (inli' nflnpted in doilvvr mun-rial from said second mixing vimmihi' uompurilnunt inlo :1 third setLilng chamber.

.i'T. in means for use in separating the more soluble conhiiilionin of :1 material from tin! less soluble constituents thui-vof, the combination of it plurality of settling chamiNi'H having huille plates mounted therein; a mixing chamiu-r; conduits connecting" the said mixing chamber to the llilpii 1m 11' mi one of said settling chambers, and to the limo! in-L 01' nnniiioi' of Hilitl chamliew; a conduit connect in Halli mixing chamber to a third settling chamber; and

nwnns i'ui' (-irvniniing iiiliiiiii'li through sliid mixing chnm- Sig-nod hy mo, this 28" clay of Docomhor 1905.

THOMAS GitISWULI), JR.

Mivstud I) J NU. F. mimmm, G. W. SAYwnLL. 

